#元组交互
t1=()
print(t1)
t2=(1,2,3,4,(5,6,7),(8,9))
print(t2)
t3=("yuanzu","yuansu","shanghai")
print(t3)
t4=t1+t2
print(t4)
t5=t2+t3
print(t5)
print(t3[0])
print(t3[1])
print(t3[2])
print(t3[0:2])

